At the Abbey of the Eight you have to speak to Gungrim. He will say that he hates his work and that he wants to leave, but lacks the funds to do it. He wants you to deliver a letter to his cousin Asvorn Hairy-Legs, asking to help him out.
You must travel to Chorrol and give Asvorn the letter. He will be thankful for the help and give you as a reward.